Impact piston

Abstract

An improved piston for a pneumatic hand engraving impact power tool. More specifically, the invention provides a piston for an engraving impact tool made from a material that is more dense than steel. In addition the invention provides an improved piston for fine engraving using a microscope utilizing a soft faced piston.

1 - 16 . (canceled) 
   
   
       17 . A hand engraving pneumatic impact tool for use with a supply of pressurized fluid comprising:
 a cylinder;   a piston received in said cylinder for bi-directional movement within said cylinder; and   said piston made from a material with a density greater than  12  grams per cubic centimeter.   
   
   
       18 . A hand engraving pneumatic impact tool as recited in  claim 17  wherein:
 said piston made from an alloy containing tungsten.   
   
   
       19 . A hand engraving pneumatic impact tool as recited in  claim 18  wherein:
 said piston made from an alloy containing copper.   
   
   
       20 . A hand engraving pneumatic impact tool as recited in  claim 17  wherein:
 said piston made from an alloy containing carbide.   
   
   
       21 . A hand engraving pneumatic impact tool as recited in  claim 20  wherein:
 said piston made from an alloy containing cobalt.   
   
   
       22 . A hand engraving pneumatic impact tool as recited in  claim 17  wherein:
 said piston is not filled with a heavy second material in a hollowed out portion within itself.   
   
   
       23 . A hand engraving pneumatic impact tool for use with a supply of pressurized fluid comprising:
 a cylinder;   a piston received in said cylinder;   an impact surface at one end of said cylinder for said piston to impact against; and   said piston having a soft face that engages with said impact surface.   
   
   
       24 . A hand engraving pneumatic impact tool as recited in  claim 23  wherein:
 said soft face is made from either a nylon, a rubber, a leather, a urethane, a thermoplastic or a elastomer material.   
   
   
       25 . A method of hand engraving an object comprising:
 providing an impact power tool having a cylinder having a first end and a second end;   a piston received in said cylinder for bi-directional movement between said first end and said second end;   an impact surface positioned at said first end of said cylinder for said piston to impact against; and   said piston made from a material with a density greater than about 12 grams per cubic centimeter;   
   
   
       26 . A method of hand engraving an object as recited in  claim 25  wherein: said piston made from an alloy containing tungsten. 
   
   
       27 . A method of hand engraving an object as recited in  claim 25  wherein: said piston made from an alloy containing carbide. 
   
   
       28 . A method of hand engraving an object as recited in  claim 25  wherein: said piston made from an alloy containing molybdenum. 
   
   
       29 . A method of hand engraving an object as recited in  claim 25  wherein: said piston made from a material containing lead. 
   
   
       30 . A method of hand engraving an object as recited in  claim 25  wherein: said piston made from a material containing gold. 
   
   
       31 . A method of hand engraving an object as recited in  claim 25  wherein: said piston made from a material containing tungsten, carbide, and cobalt. 
   
   
       32 . A method of hand engraving an object as recited in  claim 25  wherein: said piston made from a material containing tungsten and copper. 
   
   
       33 . A method of hand engraving an object as recited in  claim 25  wherein: said piston made from a material containing tungsten, molybdenum.